WO2014092222A1 - Circuit hydraulique pour engins de chantier - Google Patents

Circuit hydraulique pour engins de chantier Download PDF

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Publication number
WO2014092222A1
WO2014092222A1 PCT/KR2012/010933 KR2012010933W WO2014092222A1 WO 2014092222 A1 WO2014092222 A1 WO 2014092222A1 KR 2012010933 W KR2012010933 W KR 2012010933W WO 2014092222 A1 WO2014092222 A1 WO 2014092222A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
center bypass
valve
pump
switching valve
Prior art date
Application number
PCT/KR2012/010933
Other languages
English (en)
Korean (ko)
Inventor
손영진
윤성근
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 볼보 컨스트럭션 이큅먼트 에이비 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to EP12890015.6A priority Critical patent/EP2933504B1/fr
Priority to CA2893575A priority patent/CA2893575C/fr
Priority to PCT/KR2012/010933 priority patent/WO2014092222A1/fr
Priority to KR1020157015141A priority patent/KR101729585B1/ko
Priority to US14/651,469 priority patent/US20150316078A1/en
Publication of WO2014092222A1 publication Critical patent/WO2014092222A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0427—Heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F15B2211/611—Diverting circuits, e.g. for cooling or filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6658—Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode

Definitions

  • the present invention relates to a hydraulic circuit for construction machinery, in particular, when working in the winter or cold, construction machinery that allows the operator to raise the oil oil temperature or engine temperature to a temperature suitable for operating the equipment without having to get in the driver's seat before starting work It relates to a hydraulic circuit for.
  • a first hydraulic actuator (for example, an arm cylinder 5 and an optional cylinder 6) connected to the first hydraulic pump 2 through a first center bypass passage 7;
  • a second hydraulic actuator (not illustrated bucket cylinder) connected to the second hydraulic pump 3 through a second center bypass passage 9;
  • An spool 12 for an option device which is installed in the first center bypass passage 7 and controls the starting, stopping, and direction change of the option device cylinder 6 at the time of switching;
  • a bucket spool 13 installed in the second center bypass passage 9 and controlling the starting, stopping and redirection of the bucket cylinder during switching;
  • first and second center bypass valves 14 and 15 which block the return to the hydraulic tank and return the hydraulic oil from the first and second hydraulic pumps 2 and 3 to the hydraulic tank T when neutral;
  • an operation lever 16 (RCV lever) for outputting an operation signal corresponding to the operation amount during the operation by the driver.
  • reference numeral 17 is switched by the pilot signal pressure supplied from the pilot pump 4 so as to control the hydraulic oil supplied from the first and second hydraulic pumps 2 and 3 to the first and second hydraulic actuators, respectively.
  • Main control valve (MCV) with spools MCV with spools
  • the pressure of the first and second hydraulic pumps 2 and 3 is increased to the relief pressure to the maximum, and the first and second hydraulic pumps 2, 3)
  • the operating lever 16 is operated by boom-up or arm-in / out to raise the hydraulic oil temperature so that the hydraulic oil of the first and second hydraulic pumps 2 and 3 can be combined to operate at the maximum output condition. .
  • the pilot signal pressure supplied from the pilot pump 4 is supplied to the main control valve 17 via the safety solenoid valve 18 and the operation lever 16.
  • the arm cylinder 5 is operated by the hydraulic oil discharged from the first and second hydraulic pumps 2 and 3 and supplied via the first and second arm spools 8 and 11.
  • the hydraulic oil supplied from the first and second hydraulic pumps (2, 3) to the arm cylinder (5) via the main relief valve 19 the hydraulic tank (T) Relieve pressure will form the maximum pressure.
  • the first and second arm spools 8 and 11 of the main control valve 17 are returned to their initial positions by the elastic restoring force of the valve spring.
  • the hydraulic oil from the pumps 2 and 3 is returned to the hydraulic tank T along the first and second center bypass passages 7 and 9 of the main control valve 17. That is, since no load is generated in the first and second hydraulic pumps 2 and 3, the operating oil oil temperature cannot be increased. Therefore, in order to increase the oil temperature in the winter, the driver maintains the operation of continuously operating the operation lever 16 in one direction, causing pain in the driver's arm, and the inconvenience of falling in the cold in the driver's seat before starting work. You will take it. In consideration of this, when the driver changes the operation direction of the operation lever 16 to arm out, the driving radius of the arm is increased, thereby injuring the worker around the equipment.
  • control lever 16 In addition, in order to raise the operating oil oil temperature or the engine temperature to be suitable for the work in winter, only the control lever 16 is continuously operated for several tens of minutes (for example, 30 to 40 minutes) without a driver working in the driver's seat. Since the operation is a problem that can lead to waste of time.
  • the present invention is to solve the above-mentioned problems, when working in the winter or cold climate, the hydraulic circuit for construction machinery that can preheat the hydraulic fluid so that the pressure of the hydraulic pump rises to the relief pressure without the driver riding in the driver's seat
  • the purpose is to provide.
  • An object of the present invention is to provide a hydraulic circuit for construction machinery that can prevent the occurrence of a safety accident due to an operation lever misoperation, without the operator directly operating the work device to increase the operating oil oil temperature.
  • the first and second hydraulic pump and pilot pump connected to the engine
  • a first hydraulic actuator connected to the first hydraulic pump through a first center bypass passage
  • a second hydraulic actuator connected to the second hydraulic pump through a second center bypass passage
  • An operation lever for outputting an operation signal corresponding to the operation amount during operation by the driver
  • the spools which are respectively switched by the pilot signal pressure supplied from the pilot pump by the operation lever operation so as to control the flow direction of the hydraulic fluid supplied from the first and second hydraulic pumps to the first and second hydraulic actuators, respectively.
  • a main control valve provided;
  • the first and second center bypass passages inside the main control valve are installed to be opened and closed, respectively, the first and second to shut off the return of the hydraulic oil from the first and second hydraulic pump to the hydraulic tank when switching to the closed state; 2 center bypass valve;
  • a switching valve installed to open and close the signal path between the pilot pump and the first and second center bypass valves.
  • the switching valve is switched by an electrical control signal input from the outside, it characterized in that the electric switching valve for opening and closing the signal path connected to the pilot pump is used.
  • the electrical switch is characterized in that it is installed outside the cabin.
  • the electrical switch is characterized in that installed in the cabin.
  • the switching valve is characterized in that it is disposed on the upstream side of the safety solenoid valve is switched on when operating the safety lever mounted on the driver's side.
  • the switching valve is characterized in that it is disposed on the downstream side of the safety solenoid valve which is switched on when operating the safety lever mounted on the driver's side.
  • the pressure of the hydraulic pump is increased to the relief pressure by a switch operation to raise the hydraulic oil temperature or the engine temperature, and the operator is outside the cabin while the hydraulic oil is preheated. You can relax in the comfort and convenience. Since the operation of the work device becomes unnecessary to preheat the hydraulic fluid, there is an effect of preventing the occurrence of a safety accident due to an incorrect operation of the operating lever.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to a preferred embodiment of the present invention.
  • a plurality of first hydraulic actuators (for example, an arm cylinder 5, an optional cylinder 6, etc.) connected to the first hydraulic pump 2 via a first center bypass passage 7;
  • a plurality of second hydraulic actuators (for example, a boom cylinder, a bucket cylinder, etc. not shown) connected to the second hydraulic pump 3 through a second center bypass passage 9;
  • An operation lever 16 (RCV lever) for outputting an operation signal corresponding to the operation amount during operation by the driver;
  • the first and second center bypass passages 7 and 9 inside the main control valve 17 are installed to be opened and closed, respectively, and are switched from the first and second hydraulic pumps 2 and 3 when switched to the closed state.
  • a switching valve 21 installed on the signal path 20 between the pilot pump 4 and the first and second center bypass valves 14 and 15 so as to be opened and closed.
  • the switching valve 21 is switched by an electrical control signal input from the electric switch 22, an electric switching valve for opening and closing the signal path 20 connected to the pilot pump (4) can be used.
  • the electric switch 22 may be installed outside the cabin (not shown) so that the driver may preheat the hydraulic fluid by switching the switching valve 21 without being in the driver's seat.
  • the electrical switch 22 may be installed at one side of a driver's seat inside a cabin (not shown).
  • the switching valve 21 is ON when operating a safety lever (not shown) mounted on the side of the driver's seat (not shown). It may be disposed upstream of the safety solenoid valve 18 to be switched to the state. This allows the driver to switch the switching valve 21 without operating the safety lever in order to raise the hydraulic oil temperature.
  • the switching valve 21 is turned on when the safety lever mounted on the driver's seat (not shown) is operated (that is, lifting upward from the cabin inner bottom). It can be disposed downstream of the safety solenoid valve 18. Therefore, when the driver operates the safety lever to increase the hydraulic oil temperature, the switching valve 21 is interlocked and switched, and when the safety lever is not operated, the switching valve 21 blocks the pilot signal passage. State is maintained.
  • FIG. 1 the configuration except for the switching valve 21 provided in the signal switch 20 between the electrical switch 22 and the pilot pump 4 and the first and second center bypass valves 14 and 15 is illustrated in FIG. Since the construction is the same as the construction of the hydraulic circuit for construction machinery shown in 1, detailed description thereof is omitted, and overlapping reference numerals refer to the same hydraulic components.
  • the boom cylinder (not shown) or the arm cylinder 5 is provided with the first and second arm spools 8 and 11 for joining in the main control valve 17, the first and second hydraulic pumps 2, The hydraulic oil discharged from 3) can be joined by the first and second arm spools 8 and 11 to be supplied to the arm cylinder 5.
  • the joining spool is not provided in the main control valve 17, such as the cylinder for the option device 6, as the operation lever (not shown) is operated to operate the option device (breaker, etc.)
  • the spool 12 for option device is switched by the pilot signal pressure supplied from the pilot pump 4.
  • the hydraulic oil from the first hydraulic pump 2 is moved along the first center bypass passage 7 to be supplied to the option device cylinder 6 after passing through the option device spool 12.
  • the pilot signal pressure according to the operation of the operation lever is applied to the second center bypass valve 15 to switch the internal spool to the left in the drawing, the hydraulic oil discharged from the second hydraulic pump 3 The return to the hydraulic tank (T) is blocked.
  • the hydraulic oil from the second hydraulic pump 3 is supplied to the hydraulic oil supplied from the first hydraulic pump 2 to the cylinder 6 for the option device via the inner passage 23 of the main control valve 17. Will join.
  • the switching valve 21 is input.
  • the internal spool is switched downward in the drawing by the electrical control signal.
  • the pilot signal pressure from the pilot pump 4 passes through the switched valve 21, and then moves along the signal path 20 to be transmitted to the first and second center bypass valves 14 and 15. .
  • the hydraulic oil discharged from the first and second hydraulic pumps 2 and 3 is elevated to the relief pressure and then returned to the hydraulic tank T via the main relief valve 19 of the main control valve 17. Lose. Therefore, the operating lever 16 is operated by the driver of the driver's seat up to the maximum stroke in winter to raise the pressure of the first and second hydraulic pumps 2 and 3 to the maximum, thereby increasing the hydraulic oil temperature. You can get it.
  • the safety lever mounted on the side of the driver's seat is in a safe state (the safety lever is positioned on the bottom surface of the cabin and operated by the driver). Even when the lever 16 is operated, the pressure of the first and second hydraulic pumps 2 and 3 can be raised to the maximum in a state where the working device is not operated. This makes it unnecessary to operate the operating lever in order to preheat the hydraulic fluid, it is possible to prevent the safety accident that may occur due to the incorrect operation of the operating lever (16).
  • the operator when operating in winter or cold areas, the operator operates the operating lever in a cold cabin for a long time to preheat the hydraulic fluid as the operator preheats the hydraulic pump to the maximum pressure of the hydraulic pump even outside the cabin. Discomfort is eliminated.
  • the driver since the driver can preheat the hydraulic fluid without operating the control lever, it is possible to prevent the occurrence of a safety accident due to a malfunction of the control lever.
  • the driver when working in the winter or cold conditions, there is an effect that the driver can raise the oil oil temperature or the engine temperature to a temperature suitable for operating the equipment without having to get in the driver's seat before starting work.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

L'invention porte sur un circuit hydraulique pour un engin de chantier, qui est apte à élever la température du fluide hydraulique jusqu'au niveau approprié pour un équipement de travail, même si le siège du conducteur n'est pas occupé avant le démarrage du travail lorsque le conducteur travaille pendant la saison d'hiver ou analogue. Le circuit hydraulique pour un engin de chantier selon la présente invention comprend : des première et seconde pompes hydrauliques et une pompe pilote ; un premier actionneur hydraulique raccordé à la première pompe hydraulique au moyen d'un premier trajet de dérivation central ; un second actionneur hydraulique raccordé à la seconde pompe hydraulique au moyen d'un second trajet de dérivation central ; un levier d'actionnement ; une vanne de commande principale destinée à commander la direction de l'écoulement du fluide hydraulique qui est fourni aux premier et second actionneurs hydrauliques à partir des première et seconde pompes hydrauliques, respectivement, par une manœuvre du levier d'actionnement ; des première et seconde vannes de dérivation centrales agencées respectivement en aval des premier et second trajets de dérivation centraux dans la vanne de commande principale de telle sorte que les première et seconde vannes de dérivation centrales peuvent s'ouvrir et se fermer ; et une vanne de commutation agencée dans le trajet de signal entre la pompe pilote et les première et seconde vannes de dérivation centrales de telle sorte que la vanne de commutation peut s'ouvrir et se fermer.
PCT/KR2012/010933 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier WO2014092222A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP12890015.6A EP2933504B1 (fr) 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier
CA2893575A CA2893575C (fr) 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier
PCT/KR2012/010933 WO2014092222A1 (fr) 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier
KR1020157015141A KR101729585B1 (ko) 2012-12-14 2012-12-14 건설기계용 유압회로
US14/651,469 US20150316078A1 (en) 2012-12-14 2012-12-14 Hydraulic circuit for construction machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2012/010933 WO2014092222A1 (fr) 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier

Publications (1)

Publication Number Publication Date
WO2014092222A1 true WO2014092222A1 (fr) 2014-06-19

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ID=50934498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/010933 WO2014092222A1 (fr) 2012-12-14 2012-12-14 Circuit hydraulique pour engins de chantier

Country Status (5)

Country Link
US (1) US20150316078A1 (fr)
EP (1) EP2933504B1 (fr)
KR (1) KR101729585B1 (fr)
CA (1) CA2893575C (fr)
WO (1) WO2014092222A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016208780A1 (fr) * 2015-06-22 2016-12-29 볼보 컨스트럭션 이큅먼트 에이비 Circuit hydraulique pour engin de chantier

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102609129B1 (ko) * 2016-12-21 2023-12-01 에이치디현대인프라코어 주식회사 건설 기계
JP6731373B2 (ja) * 2017-03-30 2020-07-29 日立建機株式会社 建設機械

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EP2933504B1 (fr) 2018-11-07
EP2933504A4 (fr) 2016-07-20
EP2933504A1 (fr) 2015-10-21
KR101729585B1 (ko) 2017-04-24
CA2893575A1 (fr) 2014-06-19
KR20150092161A (ko) 2015-08-12
CA2893575C (fr) 2018-07-10

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